$(function(){
	    var World = Backbone.Model.extend({
	        //创建一个World的对象，拥有name属性
	        name: null
	    });

	    var Worlds = Backbone.Collection.extend({
	        //World对象的集合
	        initialize: function (models, options) {
	            this.bind("add", options.view.addOneWorld);
	        }
	    });
	    
	    var AppView = Backbone.View.extend({
	    	el: $("#app_content"),
	        initialize: function () {
	            //构造函数，实例化一个World集合类，并且以字典方式传入AppView的对象
	            this.worlds = new Worlds(null, { view : this })
	        },
	        events: {
	            "click #check":  "checkIn"   //事件绑定，绑定Dom中id为check的元素
	        },
	        checkIn: function () {
	            var world_name = prompt("请问，您是哪星人?");
	            if(world_name == "") world_name = '未知';
	            var world = new World({ name: world_name });
	            this.worlds.add(world);
	        },
	        addOneWorld: function(model) {
	            $("#world-list").append("<li>这里是来自 <b>" + model.get('name') + "</b> 星球的问候：hello world！</li>");
	        }
	    });
	    //实例化AppView
	    var appview = new AppView();
	});
